Effect of Aluminum Hydroxide Sedimentation, Sand Filtration and Chlorination on the Virus of Poliomyelitis

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Abstract
The virus was not removed from water by Al hydroxide sedimentation and filtration methods which removed 99.6% of Escherichia coli. Virus was removed from an artificially inoculated water by producing an Al hydroxide sediment of 1.5 ml. per liter. The virus was not activated by this procedure but remained in an increased conc. in the sediment. Samples collected from 3 of 4 water-purification plants did not contain a sufficiently high conc. of Al hydroxide to sediment the poliomyelitis virus. Cl in a conc. of 1.5 ppm. for 25 min. inactivated the MV strain; the DG strain was inactivated by 1 ppm. but not by 0.9 ppm. for 25 min. These concs. of Cl are greater than those recommended for the production of bacteriologically safe drinking or swimming-pool water.

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